Norbert Gerhards wrote:
Hi, I recently switched from an old CRT monitor to an IBM TFT, running 1024x768 @ 60 Hz. My machine is a Sun Ultra Enterprise 2 with a Sun SBus card TG+, found by debian as 'cgsix'. Although I entered r1024x768@60 in Open BootPROM, the horizontal frequency is obviously not 60 Hz, but higher, which results in a very 'unsteady' screen. Where and how can I force the 60 Hz to the cgsix driver? Thanks in advance, Norbert
Hi Norbert, Unfortunately Sun doesn't support 1024x768@60hz.on the TGX+ (Bt467 RAMDAC). It is supported on the regular TGX (Bt 458 RAMDAC) though. The supported frequencies for 1024x768 on the TGX+ are 66hz and 77hz. If I remember correctly, the resolution/refresh rate can be set either in the OBP or by grounding the proper sense pins on the video connector, and I believe the OBP setting has priority but I might be mistaken. The stability issues that you're seeing might also be related to the composite sync (R/G/B/S) coming from the framebuffer if the monitor you're trying to use is expecting separate horizontal/vertical sync (R/G/B/H/V). More info can be found here: http://mediacast.sun.com/users/Barton808/media/Sbus_cgsix_graphics_cards800-5114-10.pdf -Brian